Hard X-ray observations of AGN - Evidence for cold matter

Details Hard X-ray observations of AGN - Evidence for cold matter Hard X-ray observations of AGN - Evidence for cold matter

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..163n&link_type=abstract

In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc

Astronomy and Astrophysics

Astronomy

3

Accretion Disks, Active Galactic Nuclei, K Lines, Optical Thickness, Seyfert Galaxies, X Ray Astronomy, Ginga Satellite, Iron Compounds, Spectral Line Width, Wave Reflection

Scientific paper

The evidence for cold matter in AGN, based on X-ray observations, is discussed. The Fe K-alpha line equivalent width and reflection hump provide constraints on the geometry and optical depth of such material, but some uncertainties still remain. The scale of the cold matter distribution is also unclear, except in a few cases. We discuss one of these cases, NGC 5548, in some detail, and conclude that the cold matter may lie further from the central continuum than may be expected for a simple accretion disc model.

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